Ophthalmic and otic memoranda / By D.B.St. John Roosa ... and Edward T. Ely.

  • Ely, Edward T. (Edward Talbot), 1850-1885
Date:
[1885]
Catalogue details

Licence: Public Domain Mark

Credit: Ophthalmic and otic memoranda / By D.B.St. John Roosa ... and Edward T. Ely. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    f ana yellow the next. 77 is essential in these tests that the patient keep his eye fixed upon the central dot during the whole examina- tion. If vision is reduced to perception of light, the patient is made to keep his eye di- rected straight forward, and a lighted candle is used in the same way as the chalk, to de- termine the limits of the field. The candle should be shaded with the hand when carried from one point to another, so that the patient will not know from what direction to expect its appearance A convenient and rapid way of testing the field is as follows : Place your- self 2 ft. from the patient, with your eye on a level with his, and directly in front of it ; if testing his right eye, for example, have him look steadily with this into your left eye, the other eye of each being closed ; then, by using the test object midway between—that is, a foot irom each—you can map out the patient's field, and at the same time compare it with your own, which is supposed to be normal. The field may be concentrically or irregu- larly contracted, or interrupted by scotomata [Gr. dnoroS, darkness] or blind-spots. To test for scotomata, carry the object from va- rious parts of the periphery of the field quite up to its centre, and observe whether there are areas where it is indistinct, or where it disappears from view altogether. Sometimes the right or left half of each field is wanting— homonymous or equilateral hemiopia [Gr.